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发明名称
Perfectionnements aux systèmes de signalisation électrique
摘要
申请公布号
FR932667(A)
申请公布日期
1948.03.30
申请号
FRD932667
申请日期
1946.08.23
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
BEATTY WILLIAM ARNOLD
分类号
H04J3/00;H04L5/00
主分类号
H04J3/00
代理机构
代理人
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